Beat me to it.
I use my S6 Edge for presentations almost exclusively. All I need is a wiFi connection to the projector or screen, and even that's unnecessary if the screen has Samsung SmartHub.
ETA: Galaxy class phones have had this since at least the S3. I dunno if iPhones do, but I'm betting that they don't.
iPhones can do PP presentations using a third party app which I think was $3-4.